/Engine/Plugins/Experimental/UIFramework/Source/Public/UIFModule.h
Set the new widget parent. It will attach the widget to the correct ReplicationOwner and add it to the WidgetTree. If the ReplicationOwner cannot be changed, a duplicate of the widget will be created and the AuthorityOnReattachWidgets will be broadcast. This function is recursive if the owner changed.
static [UUIFrameworkWidget](API\Plugins\UIFramework\UUIFrameworkWidget) * AuthorityAttachWidget ( [FUIFrameworkParentWidget](API\Plugins\UIFramework\Types\FUIFrameworkParentWidget) Parent, [UUIFrameworkWidget](API\Plugins\UIFramework\UUIFrameworkWidget) * Child )